In the rich text editor:
@ascii-malware
In a comment:
[ascii-malware](https://chowlings.com/user/ascii-malware)
For Names and Avatars:
In the rich text editor:
%ascii-malware
In a comment:
[](https://chowlings.com/user/ascii-malware) [ascii-malware](https://chowlings.com/user/ascii-malware)